"Earlier today, a bug caused some people in Pittsburgh to get prompts related to Philadelphia. We've fixed the issue," Facebook spokeswoman Emilie Fetterley wrote in an emailed statement.

Fetterley gave the same statement to the Pittsburgh Tribune hours earlier Wednesday, but users complained the problem persisted even after the social networking site told the Pittsburgh paper it fixed the issue.

We see a couple likely suspects who could be behind this prank snafu. Chief among them: the Phanatic and the gang from It's Always Sunny in Philadelphia. But to whomever is behind the mix-up, we in Philadelphia say, "Well done."